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authorDavid S. Miller <davem@davemloft.net>2009-09-30 16:12:20 -0700
committerDavid S. Miller <davem@davemloft.net>2009-09-30 16:12:20 -0700
commitb7058842c940ad2c08dd829b21e5c92ebe3b8758 (patch)
tree5fe78d599fc345ca0bcd4b083b79095a54b2921b /net/compat.c
parenteb1cf0f8f7a9e5a6d573d5bd72c015686a042db0 (diff)
downloadlinux-b7058842c940ad2c08dd829b21e5c92ebe3b8758.tar.gz
net: Make setsockopt() optlen be unsigned.
This provides safety against negative optlen at the type level instead of depending upon (sometimes non-trivial) checks against this sprinkled all over the the place, in each and every implementation. Based upon work done by Arjan van de Ven and feedback from Linus Torvalds. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/compat.c')
-rw-r--r--net/compat.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/net/compat.c b/net/compat.c
index 12728b17a22..a407c3addba 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -331,7 +331,7 @@ struct compat_sock_fprog {
};
static int do_set_attach_filter(struct socket *sock, int level, int optname,
- char __user *optval, int optlen)
+ char __user *optval, unsigned int optlen)
{
struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
@@ -351,7 +351,7 @@ static int do_set_attach_filter(struct socket *sock, int level, int optname,
}
static int do_set_sock_timeout(struct socket *sock, int level,
- int optname, char __user *optval, int optlen)
+ int optname, char __user *optval, unsigned int optlen)
{
struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
struct timeval ktime;
@@ -373,7 +373,7 @@ static int do_set_sock_timeout(struct socket *sock, int level,
}
static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
- char __user *optval, int optlen)
+ char __user *optval, unsigned int optlen)
{
if (optname == SO_ATTACH_FILTER)
return do_set_attach_filter(sock, level, optname,
@@ -385,7 +385,7 @@ static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
}
asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
- char __user *optval, int optlen)
+ char __user *optval, unsigned int optlen)
{
int err;
struct socket *sock;
@@ -558,8 +558,8 @@ struct compat_group_filter {
int compat_mc_setsockopt(struct sock *sock, int level, int optname,
- char __user *optval, int optlen,
- int (*setsockopt)(struct sock *,int,int,char __user *,int))
+ char __user *optval, unsigned int optlen,
+ int (*setsockopt)(struct sock *,int,int,char __user *,unsigned int))
{
char __user *koptval = optval;
int koptlen = optlen;